Message ID | 20170426112148.25256-1-alexandre.belloni@free-electrons.com (mailing list archive) |
---|---|
State | Superseded |
Headers | show |
Le 26/04/2017 à 13:21, Alexandre Belloni a écrit : > On sama5d2, VDD core maybe be cut while in suspend. This means registers > will be lost. Ensure they are saved and restored properly. > > Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> > --- > > Changes in v2: > - don't set MCKR or PLLAR and expect them to be properly set by the > firmware/bootloader. > > drivers/clk/at91/pmc.c | 114 +++++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 114 insertions(+) > > diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c > index 526df5ba042d..338cd293b356 100644 > --- a/drivers/clk/at91/pmc.c > +++ b/drivers/clk/at91/pmc.c > @@ -13,7 +13,9 @@ > #include <linux/clk/at91_pmc.h> > #include <linux/of.h> > #include <linux/mfd/syscon.h> > +#include <linux/platform_device.h> > #include <linux/regmap.h> > +#include <linux/syscore_ops.h> > > #include <asm/proc-fns.h> > > @@ -41,3 +43,115 @@ int of_at91_get_clk_range(struct device_node *np, const char *propname, > return 0; > } > EXPORT_SYMBOL_GPL(of_at91_get_clk_range); > + > +#ifdef CONFIG_PM > +static struct regmap *pmcreg; > + > +static struct > +{ > + u32 scsr; > + u32 pcsr0; > + u32 uckr; > + u32 mor; > + u32 mcfr; > + u32 pllar; > + u32 mckr; > + u32 usb; > + u32 imr; > + u32 pcsr1; > + u32 pcr[64]; > +} pmc_cache; > + > +static int pmc_suspend(void) > +{ > + int i; > + > + regmap_read(pmcreg, AT91_PMC_IMR, &pmc_cache.scsr); > + regmap_read(pmcreg, AT91_PMC_PCSR, &pmc_cache.pcsr0); > + regmap_read(pmcreg, AT91_CKGR_UCKR, &pmc_cache.uckr); > + regmap_read(pmcreg, AT91_CKGR_MOR, &pmc_cache.mor); > + regmap_read(pmcreg, AT91_CKGR_MCFR, &pmc_cache.mcfr); > + regmap_read(pmcreg, AT91_CKGR_PLLAR, &pmc_cache.pllar); > + regmap_read(pmcreg, AT91_PMC_MCKR, &pmc_cache.mckr); > + regmap_read(pmcreg, AT91_PMC_USB, &pmc_cache.usb); > + regmap_read(pmcreg, AT91_PMC_IMR, &pmc_cache.imr); > + regmap_read(pmcreg, AT91_PMC_PCSR1, &pmc_cache.pcsr1); > + > + for (i = 2; i < 64; i++) { > + regmap_write(pmcreg, AT91_PMC_PCR, (i & AT91_PMC_PCR_PID_MASK)); > + regmap_read(pmcreg, AT91_PMC_PCR, &pmc_cache.pcr[i]); > + } > + > + return 0; > +} > + > +static bool pmc_ready(unsigned int mask) > +{ > + unsigned int status; > + > + regmap_read(pmcreg, AT91_PMC_SR, &status); > + > + return ((status & mask) == mask) ? 1 : 0; > +} > + > +static void pmc_resume(void) > +{ > + int i; > + unsigned int mask = 0; > + u32 tmp; > + > + regmap_read(pmcreg, AT91_PMC_MCKR, &tmp); > + if (pmc_cache.mckr != tmp) > + pr_warn("MCKR was not configured properly by the firmware\n"); > + regmap_read(pmcreg, AT91_CKGR_PLLAR, &tmp); > + if (pmc_cache.pllar != tmp) > + pr_warn("PLLAR was not configured properly by the firmware\n"); > + > + regmap_write(pmcreg, AT91_PMC_IMR, pmc_cache.scsr); > + regmap_write(pmcreg, AT91_PMC_PCER, pmc_cache.pcsr0); > + regmap_write(pmcreg, AT91_CKGR_UCKR, pmc_cache.uckr); > + regmap_write(pmcreg, AT91_CKGR_MOR, pmc_cache.mor); > + regmap_write(pmcreg, AT91_CKGR_MCFR, pmc_cache.mcfr); > + regmap_write(pmcreg, AT91_PMC_USB, pmc_cache.usb); > + regmap_write(pmcreg, AT91_PMC_IMR, pmc_cache.imr); > + regmap_write(pmcreg, AT91_PMC_PCER1, pmc_cache.pcsr1); > + > + for (i = 2; i < 64; i++) { > + regmap_write(pmcreg, AT91_PMC_PCR, (i & AT91_PMC_PCR_PID_MASK)); > + regmap_write(pmcreg, AT91_PMC_PCR, pmc_cache.pcr[i]); > + } > + > + if (pmc_cache.uckr & AT91_PMC_UPLLEN) > + mask |= AT91_PMC_LOCKU; I understand the use of mask to be generic... but this one ^ is now the only one used: we can simplify (and even remove the use of a function). > + > + while (!pmc_ready(mask)) > + cpu_relax(); I would prefer to have a timeout + printk(KERN_CRIT ...) here > +} > + > +static struct syscore_ops pmc_syscore_ops = { > + .suspend = pmc_suspend, > + .resume = pmc_resume, > +}; > + > +static const struct of_device_id sama5d2_pmc_dt_ids[] = { > + { .compatible = "atmel,sama5d2-pmc" }, > + { /* sentinel */ } > +}; > + > +static int __init pmc_register_ops(void) > +{ > + struct device_node *np; > + > + np = of_find_matching_node(NULL, sama5d2_pmc_dt_ids); > + > + pmcreg = syscon_node_to_regmap(np); > + if (IS_ERR(pmcreg)) > + return PTR_ERR(pmcreg); > + > + register_syscore_ops(&pmc_syscore_ops); > + > + return 0; > +} > +/* This has to happen before arch_initcall becaues of the tcb_clksrc driver */ NIT: typo ^ (because) > +postcore_initcall(pmc_register_ops); > +#endif >
diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c index 526df5ba042d..338cd293b356 100644 --- a/drivers/clk/at91/pmc.c +++ b/drivers/clk/at91/pmc.c @@ -13,7 +13,9 @@ #include <linux/clk/at91_pmc.h> #include <linux/of.h> #include <linux/mfd/syscon.h> +#include <linux/platform_device.h> #include <linux/regmap.h> +#include <linux/syscore_ops.h> #include <asm/proc-fns.h> @@ -41,3 +43,115 @@ int of_at91_get_clk_range(struct device_node *np, const char *propname, return 0; } EXPORT_SYMBOL_GPL(of_at91_get_clk_range); + +#ifdef CONFIG_PM +static struct regmap *pmcreg; + +static struct +{ + u32 scsr; + u32 pcsr0; + u32 uckr; + u32 mor; + u32 mcfr; + u32 pllar; + u32 mckr; + u32 usb; + u32 imr; + u32 pcsr1; + u32 pcr[64]; +} pmc_cache; + +static int pmc_suspend(void) +{ + int i; + + regmap_read(pmcreg, AT91_PMC_IMR, &pmc_cache.scsr); + regmap_read(pmcreg, AT91_PMC_PCSR, &pmc_cache.pcsr0); + regmap_read(pmcreg, AT91_CKGR_UCKR, &pmc_cache.uckr); + regmap_read(pmcreg, AT91_CKGR_MOR, &pmc_cache.mor); + regmap_read(pmcreg, AT91_CKGR_MCFR, &pmc_cache.mcfr); + regmap_read(pmcreg, AT91_CKGR_PLLAR, &pmc_cache.pllar); + regmap_read(pmcreg, AT91_PMC_MCKR, &pmc_cache.mckr); + regmap_read(pmcreg, AT91_PMC_USB, &pmc_cache.usb); + regmap_read(pmcreg, AT91_PMC_IMR, &pmc_cache.imr); + regmap_read(pmcreg, AT91_PMC_PCSR1, &pmc_cache.pcsr1); + + for (i = 2; i < 64; i++) { + regmap_write(pmcreg, AT91_PMC_PCR, (i & AT91_PMC_PCR_PID_MASK)); + regmap_read(pmcreg, AT91_PMC_PCR, &pmc_cache.pcr[i]); + } + + return 0; +} + +static bool pmc_ready(unsigned int mask) +{ + unsigned int status; + + regmap_read(pmcreg, AT91_PMC_SR, &status); + + return ((status & mask) == mask) ? 1 : 0; +} + +static void pmc_resume(void) +{ + int i; + unsigned int mask = 0; + u32 tmp; + + regmap_read(pmcreg, AT91_PMC_MCKR, &tmp); + if (pmc_cache.mckr != tmp) + pr_warn("MCKR was not configured properly by the firmware\n"); + regmap_read(pmcreg, AT91_CKGR_PLLAR, &tmp); + if (pmc_cache.pllar != tmp) + pr_warn("PLLAR was not configured properly by the firmware\n"); + + regmap_write(pmcreg, AT91_PMC_IMR, pmc_cache.scsr); + regmap_write(pmcreg, AT91_PMC_PCER, pmc_cache.pcsr0); + regmap_write(pmcreg, AT91_CKGR_UCKR, pmc_cache.uckr); + regmap_write(pmcreg, AT91_CKGR_MOR, pmc_cache.mor); + regmap_write(pmcreg, AT91_CKGR_MCFR, pmc_cache.mcfr); + regmap_write(pmcreg, AT91_PMC_USB, pmc_cache.usb); + regmap_write(pmcreg, AT91_PMC_IMR, pmc_cache.imr); + regmap_write(pmcreg, AT91_PMC_PCER1, pmc_cache.pcsr1); + + for (i = 2; i < 64; i++) { + regmap_write(pmcreg, AT91_PMC_PCR, (i & AT91_PMC_PCR_PID_MASK)); + regmap_write(pmcreg, AT91_PMC_PCR, pmc_cache.pcr[i]); + } + + if (pmc_cache.uckr & AT91_PMC_UPLLEN) + mask |= AT91_PMC_LOCKU; + + while (!pmc_ready(mask)) + cpu_relax(); +} + +static struct syscore_ops pmc_syscore_ops = { + .suspend = pmc_suspend, + .resume = pmc_resume, +}; + +static const struct of_device_id sama5d2_pmc_dt_ids[] = { + { .compatible = "atmel,sama5d2-pmc" }, + { /* sentinel */ } +}; + +static int __init pmc_register_ops(void) +{ + struct device_node *np; + + np = of_find_matching_node(NULL, sama5d2_pmc_dt_ids); + + pmcreg = syscon_node_to_regmap(np); + if (IS_ERR(pmcreg)) + return PTR_ERR(pmcreg); + + register_syscore_ops(&pmc_syscore_ops); + + return 0; +} +/* This has to happen before arch_initcall becaues of the tcb_clksrc driver */ +postcore_initcall(pmc_register_ops); +#endif
On sama5d2, VDD core maybe be cut while in suspend. This means registers will be lost. Ensure they are saved and restored properly. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> --- Changes in v2: - don't set MCKR or PLLAR and expect them to be properly set by the firmware/bootloader. drivers/clk/at91/pmc.c | 114 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 114 insertions(+)